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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.3 - Chemical Reactions and Reaction Stoichiometry문제 15
3장, 문제 15

Write balanced chemical equations corresponding to each of the following descriptions: (a) Potassium cyanide reacts with an aqueous solution of sulfuric acid to form hydrogen cyanide gas. (b) When an aqueous solution of ammonium nitrite (NH4NO2) reacts with an aqueous solution of potassium hydroxide, ammonia gas, water and metal nitrate is formed. (c) When hydrogen gas is passed over solid hot iron(III) oxide, the resulting reaction produces iron and gaseous water. (d) When liquid ethanoic acid (CH3COOH) is combusted, carbon dioxide and water are formed.

검증된 단계별 안내
1
Identify the reactants and products in the reaction. The reactants are hydrogen gas (H2) and iron(III) oxide (Fe2O3), and the products are iron (Fe) and water (H2O) in the gaseous state.
Write the unbalanced chemical equation by placing the reactants on the left side and the products on the right side of the equation: \( \text{Fe}_2\text{O}_3 + \text{H}_2 \rightarrow \text{Fe} + \text{H}_2\text{O} \).
Balance the number of iron atoms. There are 2 iron atoms in iron(III) oxide, so you need 2 iron atoms in the products: \( \text{Fe}_2\text{O}_3 + \text{H}_2 \rightarrow 2\text{Fe} + \text{H}_2\text{O} \).
Balance the number of hydrogen atoms. There are 2 hydrogen atoms in each molecule of hydrogen gas and 2 hydrogen atoms in each molecule of water. To balance the hydrogen atoms, you need 3 molecules of hydrogen gas to produce 3 molecules of water: \( \text{Fe}_2\text{O}_3 + 3\text{H}_2 \rightarrow 2\text{Fe} + 3\text{H}_2\text{O} \).
Check that all atoms are balanced on both sides of the equation. In this case, there are 2 iron atoms, 6 hydrogen atoms, and 3 oxygen atoms on both sides, confirming that the equation is balanced.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Chemical Reactions

A chemical reaction involves the transformation of reactants into products through the breaking and forming of chemical bonds. In this case, hydrogen gas reacts with iron(III) oxide, indicating a reduction-oxidation process where iron is reduced and hydrogen is oxidized.
추천 영상:
가이드 코스
03:31
Chemical Properties

Balancing Chemical Equations

Balancing chemical equations is essential to ensure that the law of conservation of mass is upheld, meaning the number of atoms for each element must be the same on both sides of the equation. This involves adjusting coefficients in front of compounds to achieve equal numbers of each type of atom.
추천 영상:
가이드 코스
01:32
Balancing Chemical Equations

Oxidation-Reduction (Redox) Reactions

Oxidation-reduction reactions involve the transfer of electrons between substances, where one substance is oxidized (loses electrons) and another is reduced (gains electrons). In the given reaction, iron(III) oxide is reduced to iron, while hydrogen is oxidized to water, illustrating a classic redox process.
추천 영상:
가이드 코스
01:53
Oxidation and Reduction Reactions
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